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<span id="id1"></span><h1>常见问题<a class="headerlink" href="#faqs" title="Permalink to this headline">🔗</a></h1>
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<li class="toctree-l1"><a class="reference internal" href="general.html"> General Questions</a><ul>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-is-available-in-the-cdap-sandbox">What is available in the CDAP Sandbox?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-platforms-are-supported-by-the-cdap-sandbox">What platforms are supported by the CDAP Sandbox?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-programming-languages-are-supported-by-cdap">What programming languages are supported by CDAP?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-version-of-java-sdk-is-required-by-cdap">What version of Java SDK is required by CDAP?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-version-of-node-js-is-required-by-cdap">What version of Node.js is required by CDAP?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#i-have-a-hadoop-cluster-in-my-data-center-can-i-run-cdap-that-uses-my-hadoop-cluster">I have a Hadoop cluster in my data center, can I run CDAP that uses my Hadoop cluster?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-hadoop-distributions-can-cdap-run-on">What Hadoop distributions can CDAP run on?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#i-m-seeing-log-messages-about-the-failure-to-send-audit-log-message-while-running-the-sandbox-what-s-wrong">I’m seeing log messages about the failure to send audit log message while running the Sandbox. What’s wrong?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#i-ve-found-a-bug-in-cdap-how-do-i-file-an-issue">I’ve found a bug in CDAP. How do I file an issue?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#what-user-groups-and-mailing-lists-are-available-about-cdap">What User Groups and Mailing Lists are available about CDAP?</a></li>
<li class="toctree-l2"><a class="reference internal" href="general.html#is-cdap-on-irc">Is CDAP on IRC?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdap.html"> CDAP</a><ul>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#what-are-the-memory-and-core-requirements-for-cdap">What are the memory and core requirements for CDAP?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#how-do-i-set-the-cdap-properties-for-components-running-on-multiple-machines">How do I set the CDAP properties for components running on multiple machines?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#how-do-i-use-yarn-with-the-linux-container-executor">How do I use YARN with the Linux Container Executor?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#where-is-the-cdap-cli-command-line-interface-in-distributed-mode">Where is the CDAP CLI (Command Line Interface) in Distributed mode?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#i-ve-followed-the-install-instructions-yet-cdap-does-not-start-what-next">I’ve followed the install instructions, yet CDAP does not start. What next?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#the-cdap-ui-is-showing-a-message-namespace-cannot-be-found">The CDAP UI is showing a message “namespace cannot be found”.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#i-don-t-see-the-cdap-master-service-on-yarn">I don’t see the CDAP Master service on YARN.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#yarn-application-shows-accepted-for-some-time-but-then-fails">YARN Application shows ACCEPTED for some time but then fails.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#the-cdap-master-log-shows-permissions-issues">The CDAP Master log shows permissions issues.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#the-cdap-master-log-shows-an-error-about-the-dataset-service-not-being-found">The CDAP Master log shows an error about the dataset service not being found.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#cdap-services-on-distributed-cdap-aren-t-starting-up-due-to-an-exception-what-should-i-do">CDAP services on Distributed CDAP aren’t starting up due to an exception. What should I do?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#we-aren-t-seeing-any-metrics-or-logs-what-should-we-do">We aren’t seeing any Metrics or Logs. What should we do?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#only-the-first-flowlet-of-our-cdap-application-is-showing-activity">Only the first flowlet of our CDAP application is showing activity.</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#log-saver-process-throws-an-out-of-memory-error-the-cdap-ui-shows-service-not-ok">Log Saver Process throws an Out-of-Memory Error; the CDAP UI shows service “Not OK”</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#can-a-cdap-installation-be-upgraded-more-than-one-version">Can a CDAP installation be upgraded more than one version?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap.html#i-missed-doing-a-step-while-upgrading-how-do-i-fix-my-system">I missed doing a step while upgrading; how do I fix my system?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cloudera-manager.html"> Cloudera Manager</a><ul>
<li class="toctree-l2"><a class="reference internal" href="cloudera-manager.html#cdap-installed-on-cdh-using-cloudera-manager-gives-a-no-parcel-error-what-do-i-do">CDAP installed on CDH using Cloudera Manager gives a “No parcel” error—what do I do?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cloudera-manager.html#when-i-run-a-query-i-see-permission-error-in-the-logs-what-do-i-do">When I run a query, I see “Permission Error” in the logs. What do I do?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cloudera-manager.html#i-m-getting-a-message-about-missing-system-artifacts-how-do-i-fix-that">I’m getting a message about “Missing System Artifacts”. How do I fix that?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cloudera-manager.html#i-d-like-to-directly-access-the-parcels-how-do-i-do-that">I’d like to directly access the parcels. How do I do that?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="cdap-pipelines.html"> Pipelines</a><ul>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#do-i-need-to-be-a-developer-to-use-cdap-pipelines">Do I need to be a developer to use CDAP Pipelines?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#are-cdap-pipelines-available-in-cdap-sandbox-mode">Are CDAP pipelines available in CDAP Sandbox mode?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#on-which-public-clouds-does-cdap-work">On which public clouds does CDAP work?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#do-cdap-pipelines-integrate-with-apache-sentry-for-authorization">Do CDAP Pipelines integrate with Apache Sentry for authorization?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#if-i-have-a-question-about-a-data-pipeline-i-am-building-how-can-i-get-help">If I have a question about a data pipeline I am building, how can I get help?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#if-i-have-found-a-issue-with-cdap-pipelines-how-can-i-report-it">If I have found a issue with CDAP pipelines, how can I report it?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#i-am-interested-in-contributing-to-cdap-pipelines-how-can-i-get-started">I am interested in contributing to CDAP Pipelines; how can I get started?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#i-have-a-feature-request-for-cdap-pipelines-how-can-i-get-it-added">I have a feature request for CDAP Pipelines; how can I get it added?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#what-should-i-do-if-i-see-any-of-these-errors-in-the-cdap-studio-user-interface">What should I do if I see any of these errors in the CDAP Studio User Interface?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#in-which-order-do-plugin-properties-appear-in-the-cdap-studio">In which order do plugin properties appear in the CDAP Studio?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#what-happens-if-i-don-t-have-a-property-of-the-plugin-in-the-widget-json">What happens if I don’t have a property of the plugin in the Widget JSON?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#what-happens-when-i-use-an-invalid-widget-in-the-widget-json">What happens when I use an invalid widget in the Widget JSON?</a></li>
<li class="toctree-l2"><a class="reference internal" href="cdap-pipelines.html#my-plugin-is-not-showing-up-correctly-in-the-cdap-studio-what-should-i-look-at">My plugin is not showing up correctly in the CDAP Studio; what should I look at?</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="additional-resources">
<h2>Additional Resources<a class="headerlink" href="#additional-resources" title="Permalink to this headline">🔗</a></h2>
<div class="section" id="check-our-issues-database-for-known-issues">
<h3>Check our Issues Database for known issues<a class="headerlink" href="#check-our-issues-database-for-known-issues" title="Permalink to this headline">🔗</a></h3>
<p>When trying to solve an issue, one source of information is the CDAP Issues database.
The <a class="reference external" href="https://issues.cask.co/issues/?jql=project%3DCDAP%20AND%20resolution%3DUnresolved%20ORDER%20BY%20priority%20DESC">unresolved issues can be browsed</a>;
and using the search box in the upper-right, you can look for issues that contain a particular problem or keyword:</p>
<a class="reference internal image-reference" href="_images/faqs-cdap-issues.png"><img alt="_images/faqs-cdap-issues.png" class="align-center" src="_images/faqs-cdap-issues.png" style="width: 8in;" /></a>
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<div class="section" id="ask-the-cdap-community-for-assistance">
<h3>Ask the CDAP Community for assistance<a class="headerlink" href="#ask-the-cdap-community-for-assistance" title="Permalink to this headline">🔗</a></h3>
<p>You can post a question at the <a class="reference external" href="https://groups.google.com/d/forum/cdap-user">cdap-user&#64;googlegroups.com</a>.</p>
<p>The <em>cdap-user</em> mailing list is primarily for users using the product to develop
applications. You can expect questions from users, release announcements, and any other
discussions that we think will be helpful to the users.</p>
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